Call recording does not work

I am developing a call recording function for an application. When I use a sound source like VOICE_CALLor VOICE_UPLINKor VOICE_DOWNLINK, the output file is empty. when I change the sound source to MIC, then the file is created, but MICdoes not record another side voice. Can anyone help?

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Source: https://habr.com/ru/post/1678701/


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